Magnetic transmission assembly

Abstract

A magnetic transmission assembly is adapted to integration with a motor or generator. The magnetic transmission assembly includes a rotor, a stator, and a magnetically conductive element. The rotor and the stator are sleeved coaxially and respectively have R and ST1 pole pairs. The magnetically conductive element is located between the rotor and the stator, and has permeable regions. When the magnetically conductive element is actuated, the magnetically conductive element selectively enables PN1 or PN2 permeable regions to be corresponding to the rotor and the stator. The permeable regions corresponding to the rotor and the stator interact with magnetic fields of the R and ST1 pole pairs to generate a predetermined variable-speed ratio. The magnetic transmission assembly can be integrated into the motor, so as to improve the drive power density.

What is claimed is: 
     
       1. A magnetic transmission assembly, comprising:
 a rotor, having a plurality of poles, wherein the poles of the rotor have R pole pairs; 
 a stator, sleeved coaxially with the rotor, and having a plurality of poles, wherein the poles of the stator have ST1 pole pairs; and 
 a magnetically conductive element, disposed between the rotor and the stator, and having a plurality of permeable regions, wherein the magnetically conductive element comprises both PN1 and PN2 permeable regions, when the magnetically conductive element is actuated, the magnetically conductive element selectively enables the PN1 or the PN2 permeable regions to be corresponding to the rotor and the stator, and R−3≦PN1+ST1≦R+3, or ST1−3≦PN1+R≦ST1+3. 
 
     
     
       2. The magnetic transmission assembly according to  claim 1 , wherein—PN2−3≦R+ST1≦PN2+3, or R−3≦PN2+ST1≦R+3, or ST1−3≦PN2+R≦ST1+3. 
     
     
       3. The magnetic transmission assembly according to  claim 1 , wherein the magnetically conductive element comprises a first ring and a second ring, the first ring and the second ring are axially connected, the first ring has PN1 permeable blocks, the second ring has PN2 permeable blocks, and when the magnetically conductive element is axially actuated, the magnetically conductive element selectively enables the first ring or the second ring to be moved to a position between the rotor and the stator. 
     
     
       4. The magnetic transmission assembly according to  claim 1 , wherein the magnetically conductive element comprises a first ring and a second ring, the first ring is located on a radial outer side of the second ring, the first ring and the second ring are disposed between the stator and the rotor, when the magnetically conductive element is actuated, the first ring and the second ring move relatively between a first position and a second position, when the first ring and the second ring are located at the first position, the magnetically conductive element has PN1 permeable regions, and when the first ring and the second ring are located at the second position, the magnetically conductive element has PN2 permeable regions. 
     
     
       5. The magnetic transmission assembly according to  claim 4 , wherein the first ring has a plurality of first permeable blocks, the second ring has a plurality of second permeable blocks, when the first ring and the second ring are located at the first position, every neighboring two of the first permeable blocks and the second permeable blocks form one of the PN1 permeable regions, and when the first ring and the second ring are located at the second position, the first permeable blocks and the second permeable blocks respectively form one of the PN2 permeable regions. 
     
     
       6. The magnetic transmission assembly according to  claim 1 , wherein the stator comprises a plurality of induction coils, and the induction coils are energized to form the poles. 
     
     
       7. The magnetic transmission assembly according to  claim 6 , wherein the stator further comprises a pole number modulation circuit, and the pole number modulation circuit selectively switches the induction coils to the ST1 pole pairs and ST2 pole pairs. 
     
     
       8. The magnetic transmission assembly according to  claim 7 , wherein the stator further comprises a plurality of annularly disposed bumps, the induction coils are respectively wound about the bumps, when the induction coils are switched to the ST1 pole pairs, the neighboring induction coils have opposite polarities, and when the induction coils are switched to the ST2 pole pairs, the induction coils are grouped into a plurality of coil groups, and the neighboring coil groups have opposite polarities. 
     
     
       9. The magnetic transmission assembly according to  claim 8 , wherein PN2−3≦R+ST2≦PN2+3. 
     
     
       10. The magnetic transmission assembly according to  claim 8 , wherein each of the coil groups comprises three sequentially neighboring induction coils. 
     
     
       11. The magnetic transmission assembly according to  claim 8 , wherein the magnetically conductive element comprises a first ring and a second ring, the first ring and the second ring are axially connected, the first ring has PN1 permeable blocks, the second ring has PN2 permeable blocks, and when the magnetically conductive element is axially actuated, the magnetically conductive element selectively enables the first ring or the second ring to be moved to a position between the rotor and the stator. 
     
     
       12. The magnetic transmission assembly according to  claim 8 , wherein the magnetically conductive element comprises a first ring and a second ring, the first ring and the second ring are in radial contact and are sandwiched between the stator and the rotor, when the magnetically conductive element is actuated, the first ring and the second ring move relatively between a first position and a second position, when the first ring and the second ring are located at the first position, the magnetically conductive element has PN1 permeable regions, and when the first ring and the second ring are located at the second position, the magnetically conductive element has PN2 permeable regions. 
     
     
       13. The magnetic transmission assembly according to  claim 1 , wherein the magnetically conductive element comprises a first ring and a second ring, the first ring has a plurality of annularly disposed first permeable blocks, the second ring has a plurality of annularly disposed second permeable blocks, the first permeable blocks and the second permeable blocks are alternately disposed in a radial direction and sandwiched between the stator and the rotor, when the magnetically conductive element is actuated, the first ring and the second ring move relatively between a first position and a second position, when the first ring and the second ring are located at the first position, every neighboring two of the first permeable blocks and the second permeable blocks form one of the PN1 permeable regions, and when the first ring and the second ring are located at the second position, the first permeable blocks and the second permeable blocks respectively form one of the PN2 permeable regions. 
     
     
       14. The magnetic transmission assembly according to  claim 1 , wherein the magnetically conductive element comprises a first ring, a second ring, and a third ring, the first ring has a plurality of annularly disposed first permeable blocks, the second ring has a plurality of annularly disposed second permeable blocks, the third ring has a plurality of annularly disposed third permeable blocks, the first permeable blocks, the second permeable blocks, and the third permeable blocks are alternately disposed in a radial direction and sandwiched between the stator and the rotor, when the magnetically conductive element is actuated, the first ring, the second ring, and the third ring move relatively between a first position, a second position, and a third position, when the first ring, the second ring, and the third ring are located at the first position, every neighboring three of the first permeable blocks, the second permeable blocks, and the third permeable blocks form one of the PN1 permeable regions, when the first ring, the second ring, and the third ring are located at the second position, the first permeable blocks, the second permeable blocks, and the third permeable blocks respectively form one of the PN2 permeable regions, and when the first ring, the second ring, and the third ring are located at the third position, every neighboring two of the second permeable blocks and the third permeable blocks form one of PN3 permeable regions, and the first permeable blocks respectively form one of the PN3 permeable regions, wherein PN3−3≦R+ST1≦PN3+3, or R−3≦PN3+ST1≦R+3, or ST1−3≦PN3+R≦ST1+3. 
     
     
       15. The magnetic transmission assembly according to  claim 1 , wherein the material of the magnetically conductive element is a soft magnetic composite (SMC). 
     
     
       16. A magnetic transmission assembly, comprising:
 a rotor, having a plurality of poles, wherein the poles of the rotor have R pole pairs; 
 a stator, sleeved coaxially with the rotor, and having a plurality of poles, wherein the poles of the stator have ST1 pole pairs and ST1′ pole pairs of higher-order permeance harmonics; and 
 a magnetically conductive element, disposed between the rotor and the stator, and having a plurality of permeable regions, wherein the magnetically conductive element comprises both PN1 and PN2 permeable regions, when the magnetically conductive element is actuated, the magnetically conductive element selectively enables the PN1 or the PN2 permeable regions to be corresponding to the rotor and the stator, and PN1−3≦R+ST1′≦PN1+3, or R−3≦PN1+ST1′≦R+3, or ST1′−3≦PN1+R≦ST1′+3. 
 
     
     
       17. The magnetic transmission assembly according to  claim 16 , wherein PN2−3≦R+ST1′≦PN2+3, or R−3≦PN2+ST1′≦R+3, or ST1′−3≦PN2+R≦ST1′+3. 
     
     
       18. The magnetic transmission assembly according to  claim 16 , wherein the magnetically conductive element comprises a first ring and a second ring, the first ring and the second ring are axially connected, the first ring has PN1 permeable blocks, the second ring has PN2 permeable blocks, and when the magnetically conductive element is axially actuated, the magnetically conductive element selectively enables the first ring or the second ring to be moved to a position between the rotor and the stator. 
     
     
       19. The magnetic transmission assembly according to  claim 16 , wherein the magnetically conductive element comprises a first ring and a second ring, the first ring is located on a radial outer side of the second ring, the first ring and the second ring are disposed between the stator and the rotor, when the magnetically conductive element is actuated, the first ring and the second ring move relatively between a first position and a second position, when the first ring and the second ring are located at the first position, the magnetically conductive element has PN1 permeable regions, and when the first ring and the second ring are located at the second position, the magnetically conductive element has PN2 permeable regions. 
     
     
       20. The magnetic transmission assembly according to  claim 19 , wherein the first ring has a plurality of first permeable blocks, the second ring has a plurality of second permeable blocks, when the first ring and the second ring are located at the first position, every neighboring two of the first permeable blocks and the second permeable blocks form one of the PN1 permeable regions, and when the first ring and the second ring are located at the second position, the first permeable blocks and the second permeable blocks respectively form one of the PN2 permeable regions. 
     
     
       21. A split phase motor, comprising:
 a rotor, having a plurality of poles, wherein the poles of the rotor have R pole pairs; 
 a stator, sleeved coaxially with the rotor, and having a plurality of poles, wherein the poles of the stator have ST1 pole pairs; and 
 a magnetically conductive element, disposed between the rotor and the stator, and having PN1 permeable blocks, wherein the permeable blocks correspond to the rotor and the stator and form R2 stator-side pole pairs, wherein R2=|R−PN1| or R2=R+PN1, and R2 and ST1 satisfy a split phase winding chart. 
 
     
     
       22. A magnetic transmission assembly, comprising:
 a rotor, having a plurality of poles, wherein the poles of the rotor have R pole pairs; 
 a stator, sleeved coaxially with the rotor, and having a plurality of poles, wherein the poles of the stator have ST1 pole pairs; and 
 a magnetically conductive element, disposed between the rotor and the stator, and having PN1 permeable regions, the PN1 permeable regions corresponding to the rotor and the stator, and R−3≦PN1+ST1≦R+3, or ST1−3≦PN1+R≦ST1+3.